PhysicsA student reading his physics book on a lake dock notices that the distance between two incoming wave crests is about 0.65 m, and he then measures the time of arrival between the crests to be 1.8 s. What is the approximate speed of the waves?
May 7, 2011

physicshe question is: A spherical capacitor contains a solid spherical conductor of radius 0.5mm with a charge of 7.4 micro coulombs, surrounded by a dielectric material with er = 1.8 out to a radius of 1.2mm, then an outer spherical non-conducting shell, with variable charge per ...
May 1, 2011

physicsyou see lightning and then count 4 seconds till you hear the thunder. From this you conclude that the lightning strike occurred_______ a. 1400m away b. 700m away c. none of the above Can you please show me how to figure out how to get the answer?
May 1, 2011

physicsThese are problems I have been stuck on and can't figure out. Help would be greatly appreciated. 1. Blue and yellow light combinte to produce white light because ______ (Please explain what it's the correct answer) a.they absorb each other's wavelengths b. blue, ...
April 30, 2011

Business Law- EthicsI'm not sure how to go about doing this. I feel like it's an easy question but im thinking to far into it. I want to say that Davis would be the first person to be let off & Carter would be the last person to be let off. I'm not sure what order the rest would be in...
April 28, 2011

precalculusAn experiment begins with 8 cells, and the number of cells triples every week. If the expression a(b)^q computes the number of cells that are present q days after the experiment begins, how much is the value of b?
April 13, 2011

PrecalculusThe bacteria in a 8-liter container double every 2 minutes. After 55 minutes the container is full. How long did it take to fill a quarter of the container?
April 13, 2011

ChemistryDue to increased CO2 in the atmosphere, the pH of rainwater is more acidic than in the previous century. Use the following data to calculate the pH of unpolluted rainwater at 25°C: vol% in air of CO2 = 0.033; solubility of CO2 in pure water at 25°C and 1 atm = 88 mL ...
April 12, 2011

MathOn a certain road 20% of the vehicles are trucks, 16% are buses and the remainder are cars. (i) A random sample of 11 vehicles is taken. Find the probability that fewer than 3 are buses. [3] (ii) A random sample of 125 vehicles is now taken. Using a suitable approximation, ...
April 8, 2011

CalculusIf an open box has a square base and a volume of 106 in.3 and is constructed from a tin sheet, find the dimensions of the box, assuming a minimum amount of material is used in its construction. (Round your answers to two decimal places.) height in length in width in
April 4, 2011

Math I'm so confusedFind the absolute maximum and absolute minimum values, if any, of the function. (If an answer does not exist, enter DNE.) f(x) = x2 − x − 5 on [0, 5] Come someone please show me how to do these problems? I'm lost
March 30, 2011

economicsConsider an economy with the production function L^(1/3) a) Derive the Labor demand Curve b) If Labor supply curve is L^s= (w/p), calculate the equilibrium levels of real wage, labor and output. c) Assume M^s= 45 and k=3 . What is the equation of the aggregate demand curve for...
March 27, 2011

chemistry2.00 L of NO(g) at 1.00 atm and 25°C is reacted with 1.00 L of H2(g) at 2.00 atm and 25°C according to the following unbalanced equation. NO(g) + H2(g) ® N2(g) + H2O(g) Which, if either, is the limiting reactant?
March 23, 2011

maththe edges of 3 cubes are consecutive odd intergers. if the cubes aer stacked on a desk as shown, the total exposed surface area is 381. find the lenths of the sides of the cubes thanks!!
March 21, 2011

MATHHello! I am trying to finish a math assignment. it was a bunch of math questions, and I am having a very difficult time with 5 of them. I have the answers to them though. Could somebody please help me with AT LEAST a few!? thanks!! 1) A square swimming pool with a side ...
March 20, 2011

MATHHello! I am trying to finish a math assignment. it was a bunch of math questions, and I am having a very difficult time with 5 of them. I have the answers to them though. Could somebody please help me with AT LEAST a few!? thanks!! 1) A square swimming pool with a side ...
March 20, 2011

maths exponential functionsI have a maths assignment and i need help with this question my teacher is overseas at the moment and it is due when he gets back The Population P, of penguins in a certain region of Antarctica can be modeled by the relation P=Po (2) t/90, where t is time, measured in months ...
March 11, 2011

physicsA lumberjack (mass = 98 kg) is standing at rest on one end of a floating log (mass = 270 kg) that is also at rest. The lumberjack runs to the other end of the log, attaining a velocity of +2.9 m/s relative to the shore, and then hops onto an identical floating log that is ...
March 9, 2011

TrigIf = 58° and m = 120 in, what is the value of n to the nearest tenth of an inch?
March 6, 2011

precalculus An investment decreases by 4% per year for 3 years. By what total percent does it decrease after the 3 years?
March 3, 2011

precalculusAn investment decreases by 4% per year for 3 years. By what total percent does it decrease after the 3 years?
March 3, 2011

world history During the eighth century C.E., many of the rulers of Japan were A. women. B. commoners. C. from the merchant class. D. military strongmen
March 3, 2011

BioWhy do scientists think that colonial organisms were important in the evolution of multicelluar organisms? thanks!
March 2, 2011

Biowhat is another method for classifying bacteria? (other than shape or cell wall structure). thanks! :)
March 2, 2011

precalculusA bacteria culture initially contains 1500 bacteria and doubles every half hour. a) Find an expression for the number of bacteria after t hours. Q(t)= b) The number of bacteria after 20 minutes is (the answer must be an integer) c) The number of bacteria after 9 hours is
March 2, 2011

CHEMISTRYSulfur dioxide gas reacts with hydrogen sulfide gas to produce elemental sulfur (S8) and water vapor. Predict the temperature range over which this reaction is spontaneous.
March 2, 2011

BiologyWe did this lab in which we used 3 brands of hand sanitizers and did the kirby bauer test. We measured the zone of inhibition for each of the three trials in millimeter. I need to make a graph, probably a line graph but im not sure what to put for the x and the y axis because ...
February 28, 2011

PhysicsWhat happens to a magnetic field if the current carrying wire A has three times as many loops but the same current as the current carrying wire B?
February 28, 2011

Englishi AGREE, seems like he would be talking or thinking about his dead son, thats what i would do, Maybe the author intended for Amy to talk about the fence instead to show his cold personality.
February 28, 2011

Consumer Math The math lesson I am currently working on is "Income Tax Return 1040EZ" I need a certain table to figure out the problems, that table is not given. In the lesson it says to "Use the current Tax Table supplied by your local IRS to find the tax liability". I...
February 28, 2011

statisticsThe test scores for 9 students on the Unit 1 test were 35, 25, 50, 95, 80, 60, 45, 100, and 90. What is the value of the second quartile for this data set?
February 26, 2011

Math Triviayah thanks! i am having a hard time with number one. i know i could sit down and take a long time to do it...but i was wondering if their was a formula to it, or a quicker way to do it...
February 21, 2011

Math Trivia1) A school has 1-- closed lockers. Larry comes into the school and "toggles" every second locker, then Fred toggles every 3rd, Bob every 4th, etc, up to Zoe who toggles every 100th locker. After all this"toggling" how many lockers are open? 2) If you take ...
February 21, 2011

Chemistry when 0.154 g of sulfur is finely grounded and melted with campor, the freezing point of the campor is lowered by 5.47 celsius. A)what is the molecular weight of sulfur? B)what is its molecular formula? fp of campor: 178.4 kf of campor: 40
February 17, 2011

Ethics Has email impact on communication been positive or negative? why? Would you judge somebody by the quality of his or her email message? why or why not? Could someone professional reputation be enhanced or hindered by the quality and effectiveness of his or her internet ...
February 16, 2011

MathMr. Pennypacker left half of his estate to his wife; $40,000 to his daughter; half of what remained to his butler; half of what remained for the care of his favorite dog; and the remaining $6,000 to charity. What was the value of Pennypacker's estate?
February 15, 2011

PhysiologyWhat is the difference between the function of autonomic transmitters and receptors? In what way or how do they regulate effector cells that are dually innervated? Thanks!
February 15, 2011

chemistryHow much heat is associated with converting 100 g of steam at 112 degrees C to ice at -5.3 degrees C
January 27, 2011

EnglishNow I am confused. What about these sentences? I am happy to say that everyone in my family felt good/well after eating my meal. Is it well because it is an adverb that describes felt?
January 25, 2011

EnglishI felt good/well when my family said that they enjoyed it. I think that I should pick well because it is an adverb that describes how I felt, is this correct?
January 25, 2011

PhysicsA 390 kg motor boat, moving down a frictionless ramp, is connected over a massless pulley to a 193 kg counterweight that rests on a horizontal surface. The ramp is inclined by 28.6°, and the co-efficient of kinetic friction between the couterweight and the horizontal ...
January 25, 2011

physicsA major-league pitcher can throw a baseball in excess of 40.2 m/s. If a ball is thrown horizontally at this speed, how much will it drop by the time it reaches the catcher who is 17.7 m away from the point of release?
January 21, 2011

physicssealed metal container can withstand a pressure difference of 0.630 . The container initially is filled with an ideal gas at 12 and 0.80 To what temperature can you cool the container before it collapses? (Ignore any changes in the container's volume due to thermal expansion
January 15, 2011

English 3Great Gatsby Chapter 1. Why is Nick telling the story? Why is nick "confused and disgusted" at the end of this chapter?
January 13, 2011

ChemistryU+F6-->UF6 If 8.4 g UF6 are recovered from 55 kg of ore, what is the weight % of uranium in the ore? Answer in units of %
January 11, 2011

mathThe equations y=-2X+12, y=6-X, and X=0 enclose a region in quadrant I. when that region is reflected over the line y=6-X, a portion of the reflection is in quadrant II. Find the area of that resulting region.
January 11, 2011

Criminal justiceCan someone please help. Who is responsible for the concept of crime prevention? Ive been stuck on this question for two days and i need help urgent. Thank you!
January 8, 2011

StatisticsIn a study to determine if you can predict stock price based on P-E ratio, what is the response variable and what is the explanatory variable? How would you label the X and Y axes in a scatterplot of the data?
January 4, 2011

physicsa 4.0 m hockey puck is moving horizontally at 5.0 m/s. the amount of work that must be done on the puck to stop it is?
December 19, 2010

calcGiven [(x-5)/(x-3)]^2 . Find any stationary points and any points of inflection. Also find any horizontal and vertical asymptotes.
December 19, 2010

PhysicsA 16kg child on roller skates rolls 2m down an incline at 20 degrees with the horizontal. With no friction, what is the total kinetic energy of the child at the bottom of the incline?
December 13, 2010

Chemistry Gravimetric analysis does not always involve a precipitate. Consider the following problem. A mixture of calcium carbonate and calium oxide has a mass of 8.35 grams. When heated strongly, the CaCO3 in the sample decomposes into solid CaO and carbon dioxide gas. The calcium ...
December 10, 2010

HistoryCan you please find any documents (pictures, quotes, info) for the following question: Compare and contrast the economy and politics that impacted the global economy of Europe during the Middle Ages and the Renaissance. Thank You
December 9, 2010

ChemistryGravimetric analysis does not always involve a precipitate. Consider the following problem. A mixture of calcium carbonate and calium oxide has a mass of 8.35 grams. When heated strongly, the CaCO3 in the sample decomposes into solid CaO and carbon dioxide gas. The calcium ...
December 8, 2010

Chemistry Gravimetric analysis does not always involve a precipitate. Consider the following problem. A mixture of calcium carbonate and calium oxide has a mass of 8.35 grams. When heated strongly, the CaCO3 in the sample decomposes into solid CaO and carbon dioxide gas. The calcium ...
December 7, 2010

ChemistryGravimetric analysis does not always involve a precipitate. Consider the following problem. A mixture of calcium carbonate and calium oxide has a mass of 8.35 grams. When heated strongly, the CaCO3 in the sample decomposes into solid CaO and carbon dioxide gas. The calcium ...
December 6, 2010